Glass is a very good electrical insulator. How is then possible that a glass rod

Question

Glass is a very good electrical insulator. How is then possible that a glass rod can be charged by rubbing it with cloth? a) When the rod is rubbed, it becomes an electrical conductor. b) Although the rod is an insulator, any excess charge will slowly be conducted away. c) When the rod is rubbed, the part of the rod that is in contact with the cloth becomes electrically conductive. d) Because the rod is an insulator, the charge that is transferred to the surface of the rod has difficulty moving. e) None of the above answers are correct.

Explanation / Answer

b) Although the rod is an insulator, any excess charge will slowly be conducted away.

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